A440 User Manual
Contents
1. _ 1 FG RD 2 4 2 TD TD p gt 3 RD PC Cable End DCE CTS 4 gt 4 RTS DTE RTS 5 5 CTS gsn DTR 6 6 DSR genh SG 7 7 SG DB 25 Male DCD 8 3 DCD DB 25 Female DSR 20 lt 20 DTR 6 3 RS 232 Connection to a PC with DB 9 Serial Connector Shield A440 Cable End RD 2 lt 3 TD PC Cable End TD 3 2 RD DCE CTS 4 7 RTS RTS 5 ee 8 CTS EC DIR 6 gt 6 DSR O 222 0 ___e _ DB 25 Male SA o gt e DB 9 Female DSR 20 lt 4 DTR A440 User Manual 6 4 6 5 6 6 RS 232 connection to other RS 232 Devices A440 Cable End CD DB 25 Male LETTE gJ ao I N FG TD RD RTS CTS DSR SG DCD DTR User Device Cable End Using RTS CTS Handshaking with the A440 The following diagram shows the A440 connected to a Host RS 232 serial device and a Remote RS 422 serial device In this example the Host is a DTE device so the A440 is selected as DCE on the RS 232 port RS 232 Host Connection DTE DB25 FG TD RD RTS CTS SG DCD 1 2 3 4 5 FA 8 A440 DCE 1 FG FG 2 RD SG 3 TD TD 20 DSR TD 6 DTR RD 7 SG RD 8 DCD DTR DTR DSR DSR RS 422 Connection Remote 1 FG 7 sc 13 RD 25 RD 12 __ TD 24 __ TD 11 CTS 23 CTS 92. RTS 21 RTS A440s used as RS 232 LINE EXTENDERS A common use for the A440 is to use them in pairs to provide a reliable line extension setup for RS 232 devices The following three diagrams show how two A440s may be used as RS 232 line extenders while adopting different RS 232 handshaking methods A440 User Manual 6 6 1 Example showing RTS CTS handshaking The following diagram shows A440s being used as line extenders in an RS 232 RTS CTS Handshaking situation In this example the Host is DTE and the Remote is DCE which allows the use of the same straight through cable for each RS 232 connection to the A440 Connect DTE DB 25 DCE FG FG 1 FG e 75SG TD 2 gt 2 RD 12 RD RD 3 4 3 TD 24 RD DTR 20 4 CTS 13 TD DSR 6 5 RTS 25 TD SG 7 7 SG 9 DSR DCD 8 8 DCD gt 21 DSR 11 DTR 23 DTR 6 6 2 Example showing DTR DSR handshaking The following diagram shows A440s being used as line extenders in an RS 232 DTR DSR Handshaking situation In this example the Host is DTE and the Remote is DCE which allows the use of the same straight through cable for each RS 232 connection to the A440 FG 1 1 FG FG 1 1FG FG 1
3. Transient Protection RS 422 Port only Handshaking LED Indicators Power Supply Dimensions Weight Operating Temperature Stroage Temperature Asynchronous RS 232C V 24 Select as DCE or DTE DB 25 female connector Speed capability dependant on cable length up to 64k bits per second RS 422A DB 25 female connector 120W Termination Resistor Selection for the incoming handshaking lines RD amp DSR Transient Voltage Suppression Diode Surge handling capacity 600W per wire 1ps Response time per diode lt 1ms Steady state power dissipation rate of 5W Xon Xoff Software Handshaking DTR DSR Hardware Handshaking Receive Data RS 232 Green Receive Data RS 422 Green Power Yellow 9V 200mA DC Power Adapter Reverse polarity protection Plug jack 5 5mm outer 2 5mm inner diameter Outer Negative O e 84mm x 58mm x 23mm 160 grams 10 to 35 C 0 to 45 C All specifications subject to change without notice N42 DECLARATION OF CONFORMITY according to the European Commissions EMC Directive 89 336 EEC We Name of Manufacturer ALFATRON PTY LTD of Address of Manufacturer UNIT 9 36 NEW ST RINGWOOD VIC 3134 AUSTRALIA Australian Company Number ACN 005 410 819 declare under sole responsibility that the product Product Name ASeries RS 232 to RS 422 Interface Converter Model Number A440 to which this declaration relates is in conformity with the
4. following standards CISPR 22 EN 55022 class B EMI from Information Technology Equipment ITE IEC 801 2 prEN55024 2 Electro Static Discharge Immunity IEC 801 3 prEN55024 3 Radiated RF Immunity IEC 801 4 prEN55024 4 Electrical Fast Transients Immunity
5. 1 FG TD 2 gt 2RD SG 7 7SG TD 2 2RD RD 34 31D TD 13 12 RD RD 3 4 3 TD DSR 6 6 DIR TD 25 gt 24 RD DSR 6 6 DTR SG 7 7SG RD 12 13 TD SG 7 7 sG DCD 8 8DCD RD 24 25 TD DCD 8 8 DCD DTR 20 gt 20DSR___ DTR 11 9DSR DTR 20 gt 20 DSR DTR 23 gt 21 DSR DSR 9 4 11 DTR DSR 21 23 DTR A440 User Manual 6 6 3 Example showing Xon Xoff handshaking 6 7 The following diagram shows A440s being used as line extenders in an RS 232 Xon Xoff Software Handshaking situation In this example the Host is DTE and the Remote is DCE which allows the use of the same straight through cable for each RS 232 connection to the A440 DB 25 DCE Connect 1 _ 1 FG 2 gt 2 RD 3 3 TD 7 _ 7 sG Unused Handshake Lines Please note that many RS 232 devices still require their handshaking lines to be set to the correct levels even if Xon Xoff software handshaking is used When in doubt about any particular RS 232 device simply connect all the lines to the A440 RS 232 port as it will pull those lines to the correct level for operation A440 User Manual 7 0 SPECIFICATIONS RS 232C Port RS 422A Port
6. 12 Input Data RD 24 Input Data RD 11 Output Handshaking DTR 23 Output Handshaking DTR 9 Input Handshaking DSR 21 Input Handshaking DSR DCE lt gt DTE E Description Frame Ground Signal ground Transmit Data Transmit Data Receive Data Receive Data Data terminal ready Data terminal ready Data Set Ready Data Set Ready A440 User Manual 4 1 5 0 5 1 5 2 Transient Protection on RS 422 Port Power surges or electrical transient voltages can be induced into cabling by nearby lightening strikes electric motors switches and the operation of heavy industrial equipment to name a few The use of long cables as with RS 422 connections increases the exposure to transient voltages In an unprotected converter a transient of the correct magnitude can destroy the RS 422 transceiver chip on the RS 422 port However it is also possible for certain transients to pass through a converter and therefore damage any RS 232 attached equipment at the other end By using High Speed Transient Voltage Suppressors on the RS 422 port the A440 absorbs much of the transient energy on data lines and helps clamp these surge voltages to a safe level thereby protecting itself and other connected equipment from the common damage due to transients Transient voltage suppressor diodes are used on each RS 422 line Each diode has a response time of less than 1 ps with power dissipation of 600Wa
7. User Manual ASeries A440 Interface Converter RS 232 RS 422 ALFATRON The interfacing specialists A440 User Manual Version 2 02 March 1999 COPYRIGHTS All rights reserved This document may not in whole or part be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form without the express permission in writing from Alfatron Pty Ltd Copyright 1999 Alfatron Pty Ltd DISCLAIMER Alfatron Pty Ltd has made every attempt to ensure that the information contained in this document is accurate and complete Alfatron Pty Ltd makes no representation or warranties of merchantability or fitness for any particular purpose Alfatron Pty Ltd reserves the right to make changes to this document at any time without notice Therefore Alfatron Pty Ltd assumes no liability for damages incurred directly or indirectly from errors omissions or discrepancies with the hardware and the manual TRADEMARKS All Company and Product names are trademarks of the Company or Manufacturer respectively WARRANTY Alfatron warrants its products against defects in materials and workmanship for a period of one year from receipt by the customer All warranty is carried out on a return to depot basis unless an alternative warranty coverage has been arranged WARRANTY EXCLUSIONS The above warranty shall not apply to defects resulting from improper or inadequate maintenance by the customer unauthorised m
8. ceeds 50 metres The A440 provides termination resistors on the receiver side only The reason for this is that in most environments cable lengths greater than 300 metres require termination only on the receiver side The location of termination resistor switch is at the side of the A440 as shown in Figure 1 The selection of the termination resistors is as follows Switch 1 Switch 2 Receive Data RD Data Set Ready DSR Termination Resistor Termination Resistor NOT ACTIVE NOT ACTIVE Termination Resistor Termination Resistor ACTIVE ACTIVE 3 0 RS 232 SERIAL PORT PINOUT 4 0 A440 User Manual The RS 232 Serial Port of the A440 is factory configuired as DCE D 3 Pin Status and Usage Used Ground Input Output Data Output Input Data Not used Pulled High 4K7 Not used Pulled High 4K7 Output Input Handshaking Used Ground Not used Pulled High 4K7 Input Output Handshaking CONOR ON N O Set for DCE Set for DTE FG FG RD TD TD RD CTS RTS RTS CTS DTR DSR SG SG DCD DCD DSR DTR Note Pins 4 5 6 8 and 20 are pulled to the correct levels to allow a PC serial port to operate under most conditions without any additional loopback connections The Factory Default RS 232 Serial switch setting is DCE as shown here RS 422A PORT PINOUT Pin Status and Usage Signal 1 Used Ground FG 7 Used Ground SG 13 Output Data TD 25 Output Data TD
9. f the greater data transfer distances available using the RS 422 Serial protocol Please refer to Section 6 6 for cable details A440 User Manual 2 0 2 1 2 2 INSTALLATION The A440 does not require configuration but it does provide the convenience of being able to select the RS 232 port as either DCE or DTE Before connecting power to the unit please make sure that the RS 232 and RS 422 cables are securely connected to the A440 and associated devices Sections 5 and 6 contain details on cabling along with some examples of typical uses for the A440 After all cables have been connected and secured insert the power plug into the jack socket and turn the power ON The A440 is now ready for use Function of LED indicators The RS 232 LED indicator monitors the activity on the RD pin of the RS 232 serial port The LED will flash each time data is received by the A440 on this line The RS 422 LED indicator monitors the activity on the RD and RD data pair pins of the RS 422 serial port The LED will flash each time data is received by the A440 on these data pair lines The RS 232 and RS 422 LED indicators will not operate at any other time The Power LED will remain ON when the A440 has power Termination Resistors for RS 422 The A440 provides switch selectable termination resistors for the Receive Data RD and Data Set Ready DSR incoming lines Termination resistors are only required when the cable length ex
10. odifications or misues operation outside the environmental specifications for the product damage due to power surges lightening strikes or any other phenomenon outside normal operational specifications Alfatron Pty Ltd ACN 005 410 819 P O Box 4161 Unit 9 36 New St Ringwood VIC 3134 AUSTRALIA Web Site www alfatron com au AUSTRALIAN MADE A440 User Manual 1 0 PRODUCT DESCRIPTION The ASeries A440 allows RS 232 serial devices to communicate with RS 422 devices As well as transferring data this unit also provides one pair of handshaking lines either DTR DSR or CTS RTS for the control of the data flow The following illustration shows the location of all the connectors indicators and switches of the A440 RS 232 RS 232 RD Power RS 422 Serial Port LED Green LED Yellow Serial Port DCE DTE Power Jack Selection RS 422 _ Termination RS422 RD Resistor LED Green Selection Figure 1 A440 viewed from all sides Features Switch select the RS 232 port as either DCE or DTE Switch select Termination Resistors on the RS 422 port Transient protection using Transorbs LED indicators for Data Activity and Power Quality nickel plated metal case will withstand the most rugged application Using A440s as RS 232 Line Extenders A pair of A440s may be used to achieve connection of RS 232 devices over an extended distance The A440s are connected via their RS 422 ports to take advantage o
11. tts for 1 ms and a steady state power dissipation rating of 5Watts CABLE REQUIREMENTS Alfatron recommends the use of shielded cable with its products It reduces Electro Magnetic Radiation and improves noise immunity This helps minimise interference to other equipment and improves communication reliability Cable Construction The recommended shielded cable construction is as follows Solder the shield Surrounding cable wires to the Frame Ground FG pin If FG is not available use Signal Ground SG but in this case always use a separate wire for ground which is connected at both ends Make sure that the shield is connected at both ends of the cable Cable Diagrams Cable diagrams represent cable shield in the following manner This shows the cable shield soldered to FG at both ends of the cable and shows the shield running the full length of the cable Please note that the shield is treated as a totally separate wire A440 User Manual 6 0 CABLE EXAMPLES 6 1 RS 422 Connection to Other RS 422 Devices Shield AA TEEPE E A amp A440 Cable End FG 1 e _ FG SG 7 _ sc TD 13 gt __ RD TD 25 gt RD RD 12 ii Tp User Device eZ 0 FF DTR 11 2 DSR Cable End D S Male DTR 23 DsR DSR 9 ii DTR DSR 21 lt _ _ _ DT 6 2 RS 232 Connection to a PC with DB 25 Serial Connector Shield A440 Cable End FG 1
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